Headlight.



- C. W. DAKE.

HEADLIGHT.

APPLICATION FILED IAN. 31. |914.

1,152,007; 4 Patented Aug. 31, '1915.'

rn sacarse rara ernten.

CHARLES W. BAKE, 0F CHICAGO, ILLINOIS, AA SSllI'G-NOR TO PYLE-NATIONALELECTRC HEADLIGHT CQIVIPANY, 0F CHICAGO, ILLINOIS, A CORPORATON OF NEWJERSEY.

HEAELIGHT.

Specification of Letters Patent.

Application Vled January 31, 191e. Serial No. 815,599.

T0 all whom it may concern Be it known that f, CHARLES W. DARE, acitizen of the United States, residing at Chicago, in the county of Cookand State of Illinois, have invented certain new and useful Improvementsin Headlights, of which the following is a specification.

When parabolic reflectors are to be used for headlights for locomotives,automobiles and other moving vehicles, it is necessary, in order toproject the light to a long distance forward, to use a deep parabolicreflector, in order that a minimum amount of the light may pass outthrough the front thereof without striking the walls of the reector andbeing projected forward in parallel rays; but when such deep parabolicreflectors are used it becomes necessary to lace the focus very close1to the end wall o the parabola, and this results in heating anddestroying the wall of the parabola when an arc lamp is used and when anincandescent lamp is used there is not room for the glass bulb, and ithas, therefore, in the past been necessary to use a more shallowreflector than would otherwise have been used.

fn my invention provide means whereby the deep reflector so necessarymay be used without interfering with, the 'operation of the lamp andwithout being damaged thereby. v

My invention is illustrated diagrammatically in one form in theaccompanying drawing, wherein have shown in diagrammatic section aheadlight reiector in which my system is used.

is a deep parabolic reflector the rear end of which is truncated andterminates at B.

C is the focus of my reflector, which it will be noted is very close tothe bottom of the reflector. Y

L is an incandescent lam having a lament L1 shown diagrammatlcally by acircle which is at the focal poi nt C. lt will be noted that thel glassbulb extends back beyond the line where the bottom of the parabola wouldb e located were it not cut away.

E is an aperture in the wall of the parabola through which the lampsupport may be inserted.

F is an auxiliary reflector placed back of the parabolic reflector andmade up of two separate curved surfaces. The spherical surface GH hasfor its center the focus C. rlhe parabolic surface GG has for its focuspoint C. All the light rays which pass out in the angle ICI will, ofcourse, not be affected by the refiector and will be diffused in theusual manner. Those rays such as CKL which leave the focus and impingeon the parabolic surface Bf will be deected into parallelism with theaXisy as indicated.

y Those rays such as the ray CMN which leave the focus C and strike thespherical mirror GH will be returned back through the focus to impingeas at N on the parabolic surface whence they will be defiected forwardlyas at N O. rfhose rays such as CPQ which pass back to strike theparabolic mirror GG will be deflected forward along the line PQ parallelwith the axis of the lines of the two parabolas. l

It will be noted that the relative arrangement of the two parabolic andone spherical mirror is such that all those rays which strike thespherical mirror will be reflected back through the focal point along aline which strikes the wall of the main parabolic mirror, and it will benoted that all those rays which strike the smaller parabolic mirror willbe deflected forward through the aperture in the end of the largermirror. I

Thusa minimum amount of light is wasted by being diffused out though theopen mouth of the reflector.

f have shown merely a diagrammatic view of a lighting source. For thesake of convenience lf have allowed this to take the form of anincandescent electric light bulb. It is perfectly obvious that it neednot be incandescent and that it might be any kind of a light sourceandthat any light source would operate in a suitable and satisfactorymanner without departing in any way from the spirit of my invention.

l have not, of course, shown the precise arrangement of brackets,holders and the like in connection either with the support of theheadlight or the refiector itself or in connection with the source oflight, as these do having a long focal length and at a distance Intestimony whereof, I aix my signature behind the smaller open end of thefront in the presence of tWo Witnesses this 26th reflector, anintermediate reflector formed day of January, 1914.

by a section of a sphere, the three reflectors CHARLES W. DAKE. 5 set sothat their foci and center coincide and Witnesses:

lie Within the front reeotor, and a source GENEVA HIRTH,

of light located at such coincident point. LAUREL M. DOREMUS. y

